218 lines
6.9 KiB
C
218 lines
6.9 KiB
C
/* HTTPS GET Example using plain mbedTLS sockets
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*
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* Contacts the howsmyssl.com API via TLS v1.2 and reads a JSON
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* response.
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*
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* Adapted from the ssl_client1 example in mbedtls.
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*
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* Original Copyright (C) 2006-2016, ARM Limited, All Rights Reserved, Apache 2.0 License.
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* Additions Copyright (C) Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD, Apache 2.0 License.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_wifi.h"
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#include "esp_event_loop.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "lwip/err.h"
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#include "lwip/sockets.h"
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#include "lwip/sys.h"
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#include "lwip/netdb.h"
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#include "lwip/dns.h"
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#include "esp_tls.h"
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/* The examples use simple WiFi configuration that you can set via
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'make menuconfig'.
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
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#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
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/* FreeRTOS event group to signal when we are connected & ready to make a request */
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static EventGroupHandle_t wifi_event_group;
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/* The event group allows multiple bits for each event,
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but we only care about one event - are we connected
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to the AP with an IP? */
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const int CONNECTED_BIT = BIT0;
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/* Constants that aren't configurable in menuconfig */
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#define WEB_SERVER "www.howsmyssl.com"
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#define WEB_PORT "443"
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#define WEB_URL "https://www.howsmyssl.com/a/check"
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static const char *TAG = "example";
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static const char *REQUEST = "GET " WEB_URL " HTTP/1.0\r\n"
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"Host: "WEB_SERVER"\r\n"
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"User-Agent: esp-idf/1.0 esp32\r\n"
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"\r\n";
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/* Root cert for howsmyssl.com, taken from server_root_cert.pem
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The PEM file was extracted from the output of this command:
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openssl s_client -showcerts -connect www.howsmyssl.com:443 </dev/null
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The CA root cert is the last cert given in the chain of certs.
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To embed it in the app binary, the PEM file is named
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in the component.mk COMPONENT_EMBED_TXTFILES variable.
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*/
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extern const uint8_t server_root_cert_pem_start[] asm("_binary_server_root_cert_pem_start");
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extern const uint8_t server_root_cert_pem_end[] asm("_binary_server_root_cert_pem_end");
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static esp_err_t event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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/* This is a workaround as ESP32 WiFi libs don't currently
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auto-reassociate. */
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esp_wifi_connect();
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xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
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break;
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default:
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break;
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}
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return ESP_OK;
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}
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static void initialise_wifi(void)
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{
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tcpip_adapter_init();
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wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_WIFI_SSID,
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.password = EXAMPLE_WIFI_PASS,
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},
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};
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ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
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ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
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ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
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ESP_ERROR_CHECK( esp_wifi_start() );
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}
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static void https_get_task(void *pvParameters)
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{
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char buf[512];
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int ret, len;
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while(1) {
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/* Wait for the callback to set the CONNECTED_BIT in the
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event group.
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*/
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xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
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false, true, portMAX_DELAY);
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ESP_LOGI(TAG, "Connected to AP");
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esp_tls_cfg_t cfg = {
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.cacert_pem_buf = server_root_cert_pem_start,
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.cacert_pem_bytes = server_root_cert_pem_end - server_root_cert_pem_start,
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};
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struct esp_tls *tls = esp_tls_conn_http_new(WEB_URL, &cfg);
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if(tls != NULL) {
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ESP_LOGI(TAG, "Connection established...");
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} else {
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ESP_LOGE(TAG, "Connection failed...");
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goto exit;
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}
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size_t written_bytes = 0;
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do {
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ret = esp_tls_conn_write(tls,
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REQUEST + written_bytes,
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strlen(REQUEST) - written_bytes);
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if (ret >= 0) {
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ESP_LOGI(TAG, "%d bytes written", ret);
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written_bytes += ret;
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} else if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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ESP_LOGE(TAG, "esp_tls_conn_write returned 0x%x", ret);
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goto exit;
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}
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} while(written_bytes < strlen(REQUEST));
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ESP_LOGI(TAG, "Reading HTTP response...");
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do
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{
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len = sizeof(buf) - 1;
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bzero(buf, sizeof(buf));
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ret = esp_tls_conn_read(tls, (char *)buf, len);
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if(ret == MBEDTLS_ERR_SSL_WANT_WRITE || ret == MBEDTLS_ERR_SSL_WANT_READ)
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continue;
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if(ret < 0)
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{
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ESP_LOGE(TAG, "esp_tls_conn_read returned -0x%x", -ret);
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break;
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}
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if(ret == 0)
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{
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ESP_LOGI(TAG, "connection closed");
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break;
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}
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len = ret;
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ESP_LOGD(TAG, "%d bytes read", len);
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/* Print response directly to stdout as it is read */
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for(int i = 0; i < len; i++) {
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putchar(buf[i]);
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}
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} while(1);
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exit:
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esp_tls_conn_delete(tls);
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putchar('\n'); // JSON output doesn't have a newline at end
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static int request_count;
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ESP_LOGI(TAG, "Completed %d requests", ++request_count);
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for(int countdown = 10; countdown >= 0; countdown--) {
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ESP_LOGI(TAG, "%d...", countdown);
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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ESP_LOGI(TAG, "Starting again!");
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}
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}
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void app_main()
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{
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ESP_ERROR_CHECK( nvs_flash_init() );
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initialise_wifi();
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xTaskCreate(&https_get_task, "https_get_task", 8192, NULL, 5, NULL);
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}
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